Thank you so much! Yeah, these charts sort of confirm some of my frustrations. Namely that it seems like these "hard to master" champs might never eclipse an "easier to play" champion like a Garen, or this patch, a Shaco.
Ideally, in a perfect world, every champion gets a chance to shine after some amount of games. That is, do you want to just one-trick 2-3 champions? Well, maybe you can swap between Irelia, Akali, and oh, Camille. Want to play a bunch of champions? Maybe pick up some easier-to-get-going-with champions like Shaco, Garen, etc.
However, what would distress me is that as a a player, if your goal is simply to maximize winrate, that there are champions you should never play (any hard to master champ, pro-play taxed champs like Sejuani, Tahm Kench, etc.).
Some champs, I'll concede, are simply problematic when they're good (Tahm), but I certainly hope that champs like the aesthetically awesome Ionian champs aren't among them.